Hello

I have doubts concering the punctuation in the sentences found on the internet. Could the mistakes be caused by some ocr errors?

• Though called a sea, the landlocked Caspian is actually the largest lake on Earth, covering more than four times the surface area of its closest in size, North America's Lake Superior.
  
  The Olympic Games helped to keep peace among the pugnacious states of the Greek world, for a sacred truce was proclaimed during the month of the festival.
  
  Rivaling the pyramids of Egypt or even the ancient cities of the Maya as an achievement, the army of terra-cotta warriors created to protect Qin Shi Huang. China's first emperor, in his afterlife is more than 2.000 years old and took 700.000 artisans more than 36 years to complete.